dolsen



(No Model.) 2 Sheets-Sheet 1.

N. H. DOLSEN.

MAGHINE FOR REMOVING BARK PROM TIMBER.

N. PETKRS. Phuto-Lihngnpher. Wnhingnn. D. C.

2 Sheets-Sheet. 2.

(No Model.)

N. H. DOLSBN.

Q MACHINE P0Pu REMOVING BARR FROM TIMBER. No. 397,114.

Patented Feb. 5, 1889.

WInesses: WZMZ NTTED STATES PATENT OFFICE.

NINIA),T Il. DOLSEN', OF ST. IGNACE, MICHIGAN, ASSIGNOR TO EVERETT & CONNORS, OF SAME PLACE.

MACHINE FOR RE'IVIOVING BARK FROM TIMBER.

SPECIFICATION forming part of Letters Patent No. 397,114, dated February 5, 1889.

Application iiled April 26, 1888. Serial No. 271,924.

To all 'whom it may concern: v

Be it known that I, NINIAN 1I. DOLsEN, a citizen of the United States, residing at St. Ignace, in the county of Mackinac and State of Michigan, have invented certain new and useful Improvements in Machines for Removing Bark from Timber, of which the .following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in machines for removing bark from logs, posts, poles, and other forms of timber; and the invention is specially designed to remove the bark from cedar timber, in the various applications of which (as for telegraph-poles, posts for fencing or paving purposes, dac.) it is generally required to have the bark removed. In the present state of the art such removal of the bark is most economically accomplished by hand, although it is a comparatively tedious work, and if not done when the wood is in suitable condition is often very difficult to be accomplished, as the bark is liable to stick to the wood.

My machine is not intended for use only when the removal by hand-labor cannot be advantageously accomplished; but it is designed to form a labor-saving device and to do better work besides, as the log is trimmed at the same time upon the outside, by removing from it projecting knots, branches, and other protuberances which are ordinarily left in peeling by hand, and which cannot be removed as smoothly thereby.

My invention consists in a revolving cutterhead, preferably in the form of a large drum or pulley, centrally apertured and provided with radially movable knife holders, which carry upon their inner ends suitable knives for cutting off and removing the bark from the stationary log, and knife-guides which travel in contact with the log and thereby adjust the knives to the work; and, further, in the combination, with that cutter-head, of suitable self-adj usting feeding devices,\vhere by the logs of any size are fed centrally through the aperture of the cutter-head; and, further, my invention consists in the devices for removing t-he dbris from the cutter-head, all as more fully hereinafter described.

In the drawings which accompany this (No model.)

specification, Figure l is a vertical central longitudinal section of my improved machine. Fig. l is a detached perspective view of the revolving cutter-head, showing the radial adjustable knife-holders. Fig. 3 is a vertical central section through one of the knife-holders, with the knife and knife-guide secured to it. Fig. l, and is especially designed to show the anti-friction bearin gs of the cutter-head. Fig. 5 is a horizontal section of the machine in diagram.

A is the revolving cutter-head, preferably in the form of a drum, provided upon its outer face with the circumferential bearing B, to apply power by means of a suitable belt to revolve the cutter-head. This cutter-head is provided upon its ends with the heads C, upon which are formed the hollow bearings C', which are j ournaled in suitable stationary bea-rings of the supporting-frame, preferably by means of anti-friction rollers D, which are radially adjustable to take up any wear or lost motion.

E are the knife-holders, radially movably secured in the tubular sockets F, which are radially secured to the cutter-head.

To the inner ends of the knife-holders are secured the barking-knives and the knifeguides G, which are preferably made in the form of conical rollers loosely j ournaled upon a stub-shaft, a. The barking-knives are of any suitable construction, preferably as shown in the drawings, wherein ZJ is a suitable chiselknife for stripping the bark; c, the rolling cutters for cutting the bark, placed with their cutting-faces at right angles to the barkingknives. suitable tension-springs, H, and with a guide pin or pins, I, which engage into the spiral slots d., all so arranged that simultaneously with the radial adjustment of the knife-holder a rotary motion is imparted to the knife-holders, for the purpose more fully hereinafterdescribed. The sockets F are cut away at their lower portions to permit of easy acc knives and forthe pnrpos of charge of the" c The knife-holdersare provided with Fig. 4 is a cross-section on line x in TOO viehling bearings of the frame the feed-rolls J .I and .l J provided with the studs CZ', or suitably roughcned otherwise to feed the timber. One or both of each set oli' feed-rolls preferably made a live roll to carry the timber through the cutter-head indeliendent of other feeding devices, which may be suitably arranged in front andrear of the machine to carry the logs into the cutter-head and remove the barked timber therefrom.

In practice the rollin cutters C are designed to operate by cutting into the bark in a spiral path around the log while the cutter-head is revolving, and the log is prevented from rotating. The barking-knives h then strip off the spiral ribbons cut by the other knives. The different knife-holders are placed in such relation to each other as to have one spiral follow closely upon the other, so as to d euude gradually the whole outside of the log.

It will be seen that there is no necessity for carrying two barking-cutters on each knifeholder, although, if desired, it may be so arranged, and these knives are preferably arranged to overlap cach other in order to be sure tio have all the bark stripped ott'.

In feeding timber the varying diameter of the log naturally requires the radial adjustability of the knife-holders, and to this end the knife-guides are made conical to allow the ,logs easily to enter between and crowd the knives apart, and the feeding-rolls are bot-h journaled in yielding' bearings for the purpose of permitting the passage of timber of any centrally through the aliicrtures of the cutter-head. To prevent the log from rotating, I preferablymake the feed-rolle rs wi theoucavc faces and Vfori n the spurs d in the form ot. short knife-blades, as shown, which cutlongitudinally into the log, and thereby take a better hold to counteract any tendency to rotate. I

lnefcrabl y feed the timber with thesmallend Iirst, as the knives will tliereby crowd gradually apart and the passage from one log to the other is more easily accomplished.

It will be understood that the pitch of the spiral Avaries with the diameter of the log, provided the speed of the feeding devices rei nain the same. Therefore to enable thc knives to cut the same width of strip or ribbon and to remove the same it is'ne'cessary to maintain the stripping-knives at right angles to the direction of the spiral, and this is accomplished by the engagement of the wrist or pin I into the spiral slots of the sockets, which are so adjusted that as the kn ite-holders are radially expanded the knives will turn upon their axis in a corresponding ratio, so as to maintain atall times their propcr position to enable them to strip at all times the same width of riliibfln.

It will be seen that the conical form of the knifeui is h s not alone the advantage of enahl i, lyerowd the knifeholde 4 ,i t f le fmmtarymove- Y ment t To insure a Vfree discharge for the debris, 'I' preferablyprovide the cutter-heads with large circumferential apertures K between the knife-holders, and in addition thereto I generate a blast by suit-able inlet-openings, 7i., in the sides of the cutter-heads, and the wings or deliectors Ii, extending outwardly to catch the air and throw it into the interior of the cutter-head, from which it naturally tinds its exit through the apertures K, carrying away with it the dbris, a strong suction being crcated in the rotation of the cutter-head.

It is obvious that a cutter-head with one knife-hohfler maybe made operati Ve; but I prefer to usc a series of knife-holders. I am also aware that a single knife 'may be made operative to do both the cutting and stripping; but I prefer the curved chisel-knife for stripping and the rolling knives for cutting the bark to produce more perfect work.

What I claim as my invention isl. In a machine for the purpose describeill, a rotary cutter-head centrally apertured and provided with radial self-adjusting knifeholders carrying conical knife guides and barking-knives, substantially as described.

2. In a machine for the purpose tflescribcd,

a rotary cutter-head centrally apertured and provided with radial self-adjusting knifeholders rotatably secured in tubular sockets on the cutter-head, substantially as described.

3. In a machine :for the purpose described, a rotary cutter-head centrally aperturcd and carrying radiallyadjustable knife holders, the knives secured thereto, and the conical knile-guit'les, su'lfistantially as described.

In a machine tor the purpose descrilnd, the combination, with the rotary cutter-head provide `l with radially-adjustable knife-holders carrying stripping and barking' knives and conical knife-guides, of the feed-rollers arranged in yielding bearings in front and rear of thc apertures of the cnt ter-head, substantially as described.

5. In a machine for the purpose describei'l, the comlrination, with the rotary cutter-head, of the radially self-at'ljusting knife-holders consist ing of the socket Ii, the knife-holder E, radially adj ustablc th e rei i i, th c tenshm-spri ng II, the wrist I, and the spiral slot d, substantially as described.

t). In a machine for the purpose described, the combination of the fol lowi n cl ements: the eentira'lly-apertured rotary cutter-head, the radiallyadjustable knife -holders secured thereto and provided with suitable knives for cutting and stripping the bark, the knifeguides secured to the inner ends of the knifeholders in advance of the knives, the feedrollers arranged in front and rear of the apertures, and the bl ast-gencratin g devices applied to the cutter-head arranged to assist in removin the dbris, substantially as described.

7 In a machine for the purpose described, the combination of the 'following elements: the rotary cutter-head provided with apertured.

IIO

substantially as described, of the feed-rolls provided With longitudinal iiattened spurs for feeding the timber and preventing it from rotating, substantially as described.

In testimony whereof I aiiix my signature, in presence of two Witnesses, this 5th day of April, 1888.

NINIAN H. DOLSEN.

TitiieSSes:

P. M. HULBERT, JOHN SCHUMAN. 

